package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;


/**
 * @author 冰白寒祭
 * @date 2023-08-31 10:04:31
 * @description 自定义切面类, 实现公共字段自动填充逻辑
 */

@Aspect
@Component
@Slf4j
public class AutoFillAspect {


    /**
     * @MethodName: autoFillPointCut
     * @Author 冰白寒祭
     * @Description: 切入点
     * @Date: 2023/8/31 10:13
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * @MethodName: autoFill
     * @Author 冰白寒祭
     * @Description: 自定义前置通知
     * @Date: 2023/8/31 10:13
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段填充");
        // 获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType value = autoFill.value();//获取数据库操作类型

        // 获取当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        // 准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        // 根据当前不同的操作类型,为对应的属性来赋值(反射机制)
        if (value == OperationType.INSERT) {
            // 为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        } else if (value == OperationType.UPDATE) {
            // 为两个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
